[grilo-plugins] lua-factory: Add supported_media types for sources

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit 068a8d56eddfaf6c38f67ae20bc7154c01199cf9
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Apr 8 16:59:55 2014 +0200

    lua-factory: Add supported_media types for sources
    
    So that image based applications can ignore the metrolyrics and
    musicbrainz coverart sources.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727766

 src/lua-factory/sources/grl-metrolyrics.lua |    1 +
 src/lua-factory/sources/grl-musicbrainz.lua |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/lua-factory/sources/grl-metrolyrics.lua b/src/lua-factory/sources/grl-metrolyrics.lua
index f61d15a..1fbc540 100644
--- a/src/lua-factory/sources/grl-metrolyrics.lua
+++ b/src/lua-factory/sources/grl-metrolyrics.lua
@@ -29,6 +29,7 @@ source = {
   name = "Metrolyrics",
   description = "a source for lyrics",
   supported_keys = { "lyrics" },
+  supported_media = { 'audio', 'video' },
   resolve_keys = {
     ["type"] = "audio",
     required = { "artist", "title" },
diff --git a/src/lua-factory/sources/grl-musicbrainz.lua b/src/lua-factory/sources/grl-musicbrainz.lua
index 663bb3a..e8d1266 100644
--- a/src/lua-factory/sources/grl-musicbrainz.lua
+++ b/src/lua-factory/sources/grl-musicbrainz.lua
@@ -29,6 +29,7 @@ source = {
   name = "Musicbrainz Cover Art",
   description = "a source for coverart",
   supported_keys = { "thumbnail" },
+  supported_media = { 'audio', 'video' },
   resolve_keys = {
     ["type"] = "audio",
     required = { "mb-album-id" },